Grit feed valve



p 1950 w. H. MEAD 2,521,931

GRIT FEED VALVE Filed Oct. 18, 1948 3 Sheets-Sheet 1 INVENTOR. WILL/AM H. MEAD A TTORNEY W. H. MEAD GRIT FEED VALVE Sept. 12, 1950 Filed Oct. 18, 1948 3 Sheets-Sheet 2 INVENTOR. WILL/AM H. MEAD ATTORNEY Sept. 12, 1950 w. MEAD 2,521,931

GRIT FEED VALVE Filed Oct. 18, 1948 3 Sheets-Sheet 3 INVENTOR. WILL/AM H. MEAD WM a i atenteci Sept. 195 I is useful, for example; 8 a i'g'r t'ieed valve infa a bl n apparatusf'i The instant 'case 'is'-' a Tcbfi 'i tion i t fmv application filed August 1 2, 1947; sedan- 768,198; which hasi "since become abandqheWand whicl ij was 1 alsoa *co'iitinuation in, part of 'my application file'd on i ugust 2;-1945, SerialNO; 608; 38'6;whichmatured to Patent No. 2,455,5"14,issiiei1' December'i 1194s,

here the valve is'ffsho'wn in connection witlra- .siirface treating apparatusfii o v V j f f An important object bi the firesentf invention is provide a valve iorf feeding granularfmater'ial i'rito 'aconduit through which it will be transiiorted by fluid stream"under pressureandin which the "outlet 'co'nduit'is autbmatically cleared fifserer'e opening of the" valve and "again as itis Another'jo'bj ect of the invention is to provide an 1 apparatus which facilitatesremo'tecontrol for inltroduction 'of" granular 'inaterial' into a fluid Stream- ,t w, i Y u V;

' A further objet of'theinvention isfto provi'de an apparatus" whereby 'graniilar I material is inv ftroducedint'o aiconduit' or into conduits through 1' which an air blastisp'assirig;- and I the material is T'coritrolled in relation to thestar'tingand stopii'ingfof the air blast in sucha way as to keep the "conduits always openand'iree of any accumula- "tion of material. I

Other objects'and advantagesoi theinvention will be apparent rom the following description of aipreferred apparatus", in accordance with Revised Statute Section 4888; This description 'is not intended to lim t the'device in size;'shape,"

materials, or arrangement: of 'parts other than as provided in the appended cl'aims. For illustra- "tion of the use of theapparatus, it will be described in connection with a surface treating a'pparatus. I Y I Inthedrawings: I

, Fig. 1 is a view inelevation of a surface treat ing apparatus; with the"'grit"feed hopper being shown partlyin section;

This inventionrelates' o a grit feed va'lvQ-azid :(JFFICE' I I Minnelli-M ad, t team Me e "-nietaLbr "s'o rne synthetic material and max be icove'red with paint, rust,cr other'coating which terial depending upon the treatment it is dex sire'd"to'giveithe surface Ill. For purposes of illustration an abrasive treatment will be dealt iiil i th andth'is" is notintended to mean-any relinq'uis'hmentof the scope of'interpretatio'n of the invention to cover fluid-coating or treating inat-terial's. r

Ina'suiface treating-machine compressed air from anysuitable sourceis piped through aconduit I! to an aridifier I8 which separates the moisture in the air stream and lets it draininto the trap IQfrOm which it can be emptied through the'valve '.--"From the aridifier It the a-ir'passes through theconduit Zl' in-which is a hand shut- ""ofli valveH- and an electrically controlled valve f 23; The valve 22 is-to shut-off the airpressure if "the 'valve 23-"ever needs to be removed for repairs." The air then passes-through the conduit 24 into the strainer 25; From here, the conduit 25' conducts the'air into the control valve 11, detailed in Figs-2 and 3. The conduit 'l9 conducts airat the same pressure from the strainer :-25 into the 'top' of the-treating-material feed "hopper 3U soas to maintain a pressure on the top-10f the treating material ll therein. From thev'alve 2'! theair passesto the. operating head 3| throughtheccnduit'fl; 3

A; suctionflcircuit, operated by the pump as si r'zks' air andtre'atirig' materialfrom' the operating-head3i through a'conduit back to-the '{sparat'on 4|, and outfrom there through a con- "d'uit 4U to-thedust collector 39, which filters the dust;-

q Y The -'dust is drawn, as described in my previously mentioned PatentNo. 2,455,514, through the separator 4 I into the dust collectorBSibut as the "grit-'i-s'heavier'it falls into the separator hopper "4| 5 From there'it is passed'by a dump valveinto the treating-material feed hoppe'rBO. 4

i "'Threeio'rrns ofthevalve are illustrated in-Figs.

lfFig. 2 is a View in elevation and cross section 152, {Bi'dhdA. All three forms employ he' -sam'e .o'f a control valve'embo'dying the princip'les'of this invention; H a n A Fig.'3'is a view in'elevationand cross-section ot amodification; and v Fig; '4is a view in elevation andcrosssectionm of another modification, t

In the drawings the numeral i8 designatesthe "surface-being treated by asurface-treating material I I; in a treating zo ne jf2-beneath a treating head *3! f" This surface may 1 be of 1 wood, glass,

principles; and the 'same'jreference numeralsare used for -identical partsi The valve"2l is posiftion'ed in the 'bottom-of "the treating' material will 3 I the outlet conduit 32. On the opposite wall of the casing 46 a fitting 56 is slidably mounted in a housing 53 having a connecting resilient gasket 5! or 51a to provide a leak-tight fit. Means to actuate the sliding fitting 50 include the di- 5 aphragm housings 55 and which are clamped together by the bolts H35. The diaphragm housing 55 preferably is threaded intothe casing 46, and the fitting 5% slides within it. The diaphragm clampei bythe lock iiut'iifi against the shoulder I51 on the fitting 5i).

lows s2 --having its endwall 53 rigidlyiseoured to the fitting 50. The other end 54 is secured to Two relatively adjustable sleeves 51 andJ-SS-EX Jthe plate 55a mounted on the housing extension are adjustably secured in the diaphragm,hg sing 56. The sleeve 51 is threaded inside thes'l'e'v 58 and its end Bil abuts the lock nute-LSBptQiStQp the movement in one direction of,t sliding member 50. The sleeve SFaiij uststHetnSiiin on the spring 53, and has a lock nut Elite-mold};

it in a selected positiog.

In the format the invention shown in hfigs l 2, a conduit. 28, leads into' the diaphragm chamber 64, through'lthe openinggfi, this, conduit 28 connects to an .airstr'aiher giwhich prefer- In the form ottheinvention shown in Figs} an e ed o -l k ness hsshe e ii 1 h o e of th fine -fitt e P it n of the latter.

in 3v h ds th @1 91 W t-9 :llleifi i gfifinil m ld e e ieeetw ih; m t as? th ine atrzthere s ne i hstwee t e w e s bu Q 62 and 3, when; the device; 151m operation. In p latter. position th fiuidstream; moving from the l freifi i theibvre i ks 11 a 2 1. e th treating material in the ho sin 4s and carries it Lalongtothe head 3|. 7 v edits h he i nsefiqy-a ei t mee fla ot thje fitting 4"! until afpressure of alou @unds per u e n h .euilt us i he ha be T '4 hfifi se n l'e weish ills imers l,.,f 5 s1 r 'm I '5 new senese s m n e me; the position shown. Rigs This. means at me \I eKlesa sm-i-e ss .ighpough; thev conduit in the valve 2 1 ,.will .pe eas :first to e r out. he fittin wit essewillmove over andelose thebore;iflg and the it "passes into sai tww seg lbe ance p rtz ui flo wi l is wh e re t n a eria i ji nthe time" :9 the conduit ,fl eirhu a; ea dventae z-ei thi a an m s't t when te -l hes fie-p e the ev e-g n s a ee d eetei y 51%:999'1EWJ9I ste alaneine n required qimove. thent in fiaibesau ibi .rnoved automatically wan diaphragm 152.1 lez esef h o e 4. the fit i efl a r h i e i ned u eov erl git .is. "moved e A ite th seein 14$ lelaiewrfent l es; si h i e th fi in M a .izecurediinithefplate 55a. The sleeve 51a is thread- Sn tlieSpringSSFThe sleeve 58a has a reduced ably includes afilter to emove any sand'and'dust .2 ti =30 l m qve into In. all iorms of irwention There shown: a 35 l !151 eed h iil e The spring 59; is, referably 4 du 32, ce se q t eatin m t ria I e .ent ssie ethemQum-Ma.. th a a-fiwn l h fiui 5.6a with a leak-tight fit. Two relatively adestate sleeves 51a and 58a ar adjustably seed de the s le'eve 58a. and adjusts the tension .endafiflq in slidable engagement with a sleeve 6! 20 on the bellows end wall 53. The extent of movefalitl lk iv fi filltlw ee i ei re of the. fil

Rhone into t'he casing). The parts sens ti e.seeweim fisdevice is'in operation. j. The spring ilislp flfifiia bly equat etalie ibs e l pe menses eas e t l-a e n f; s t B t s-s s an e s inc ,isbui up'in the chamberf fi l'gthrough he t sh bellows- 2 nd inse enest d-fi ti a sweetest e te te r s g the the valve?! ill be used to clear out the ue ath s i -F at iflteie e a -treat n zitlis n aies e tage of this arrangement isthat' the op tor eenx-ibema ise aw i earmNewsst n a second pperator. is notv reguired, to, move the fitis? seems t" IQfaftterlthellin ally 1 sw eter amas n eta ul ginst T is cur t nslil i a t st ng, i t

0nd conduit is away from or in contact w th s e..ee i stei eeondu its ds d and means actuated byth p lien ine x "conduitxceeds the predetermined press, e of sai .eerssseaaen l ine.assesse et dee duit will automatically be moved apartii om said autom t call by th spr sea-1 le gfig i ao iiy teendil i ti 1 aneas -s eheat ense se a; w dturret n mgfimp ich ,treat'nggnatcglf 1s else??? i dreadin t ei iee eknrsssfi s ii-I dill t said conduits being movable against each other and apart from each other, means for urging said mouths normally against each other, and means operable automatically by fluid passing through said conduits for overcoming said firstnamed means and moving said mouths apart.

3. In a device for introducing granular material into an air current, the combination of: a housing into which said material may be fed; a first conduit leading from said housing to convey said material therefrom; a second conduit in said housing having means for abutting and separating its end to the end of said first conduit so that the material in said housing may not enter it when said conduits abut and may enter it when they are separated; a supply conduit for introducing an air current through said second conduit into said first conduit whether they are abutting or separated; means for normally urging said second conduit against said first conduit; and counter means actuated by the fluid in said supply conduit for urging said second conduit away from said first conduit, whereby said air current will clean out said conduits before additional material is introduced into said first conduit from said housing.

4. In a device for introducing granular material into a fluid current, the combination of a housing into which said material is fed; a first conduit leading from said housing to convey said material therefrom; a second conduit in said housing relatively movable away from or in contact with said first conduit; means for passing said fluid current from said second conduit through said first conduit in all relative positions of said conduits; a pressure-responsive diaphragm rigidly attached around a portion of said second conduit; walls cooperating with said diaphragm to enclose a chamber on one side of said diaphragm, sealed except for a bleed hole from said second conduit which is in communication with said chamber for all positions of said second conduit; and means for obtaining a predetermined pressure on the other side of said diaphragm, whereby when the pressure in said chamber exceeds the pressure on the other side of said diaphragm, said diaphragm will move said second conduit away from said first conduit so that material from said housing may enter said first conduit.

5. In a device for introducing granular material into a fluid current, the combination of a housing into which said material is fed; a first conduit leading from said housing to convey said material therefrom; a second conduit in said housing relatively movable away from or in contact with said first conduit; means for passing said fluid current from said second conduit through said first conduit in all relative positions of said conduits; a pressure-responsive diaphragm rigidly attached around a portion of said second conduit; walls cooperating with said diaphragm to enclose a chamber on one side of said diaphragm; a third conduit leading from the air supply line for said second conduit to said chamber; means in said third conduit to clean said air from grit; and means for obtaining a predetermined pressure on the other side of said diaphragm, whereby when the pressure in said chamber exceeds the pressure on the other side of said diaphragm, said diaphragm will move said second conduit away from said first conduit so that material from said housing may enter said first conduit.

WILLIAM H. MEAD.

REFERENCES CITED The following references are of record in the tile of this patent:

UNITED STATES PATENTS Number Name Date 758,118 Sticker Apr. 26, 1904 847,270 Wise Mar. 12, 1907 1,319,193 Von Porat Oct. 21,1919 1,566,517 Bergman Dec. 22, 1925 1,858,475 Wolever May 17, 1932 2,395,420 Myers Feb. 26, 1946 4 Certificate of Correction Patent No. 2,521,931 September 12, 1950 WILLIAM H. MEAD It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 3, line 5, after the Word the, second occurrence, insert diaphragm 152 secured around its circumference between the two; column 4, line 43, for valve 37 read value 27 and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 12th day of December, A. D. 1950.

THOMAS F. MURPHY,

Assistant Commissioner of Patents. 

